Radio receiving system and unit



Jan 29, 1929. 1,700,625

H. E. BURKET RADIO RECEIVING SYSTEM AND UNIT File u y 10, 1925 5 Sheefs-Sheet 1 k9 4 5 iimmmlfil l i i Jan.'2 9,1929. 1,700,625

H. E. BURKET RADIO RECEIVING SYSTEM AND UNIT File J ly 10, 1925 5 Sheets-Sheet 5 Jan. 29, 1929.

- H. E. BURKET RADIO RECEIVING SYSTEM AND UNIT 5 Sheets-Sheet 4 Filed July 10, 1925 Jan. 29, 1929. 1,700,625'

. H. E. BURKET RADIO RECEIVING SYSTEM AND UNIT Fi y 10, 1925 5 Sheets-Sheet 5 HENRY a. BURKET, 0F'CHICAGO,'IIiLI1\TQIs.

RADIO RECEIVING AND UNIT.

Application filed July 10 1925.. Serial No. 42,651.

1 This invention has to do with certain provements in radio receiving systems. The invention has reference particularly to improvements in systems for receiving speech and similar signals by the use of. carrier waves. 7

One object of the invention is to provide means for amplifying the received .signals without the need of using plural coil transformers between the stages or between de. 'tector or amplifier tubes. That is to say, it is an object of the invention to avoid the need of using transformers having more than one coil, the arrangement being such that'the desired translation of energy may be performed by the use of a react-ance coil together with suitable co-operating instrumentalities such as grid leaks, condensers, etc.

Anotherfeature of the invention relates to the provision of a. self-contained translation and amplifying unit including the necessary elements. In this connection, it is an object to bring the necessary parts of thisunit into proper relation and co-operation within a selfcontained unit having certain terminal binding posts or connections for attachment directly to the proper portions of the system such as the grid, the plate, the positive side of I the battery, the negative filament, etc

construction of the unit is to bring all of the necessary parts thereof into a very compact and closely coordinated structure of small;

same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings: Figure lshows diagrammatically a series of connections for a receiving circuit establishing a. single stage of audio frequency amplification by means of a unlt and connections embodying the features of the presentinvention;

Fig.

tions of cuit illustrated in Fig. 1; I

Fig. 3 shows diagrammatically another cir cuit or ser1es of connections embodying the features of the present invention, but in which circuit the arrangement of the unit A further object in connection with the tube 8ispr0vided with the filament 10,-

11, and plate 12, and the tube 9 is provided 2 shows diagrammatically the connecthe unit itself which is inserted into and constitutes a portion of the complete ci'r-. I

' arrangement illustrated is a convenient one,

connections is reversed as, compared to Fig. 1;

- Fig. 4 shows diagrammatically the connections of the unit of the circuit-illustrated in Fig. 3;

Fig. 5 shows a. plan view of the assembled unit itself, having the top, plate thereof markedto correspondto the terminal connections of the circuit illustrated in Figs. 1,

shows a side view corresponding to 'Fig. 5'w1th one of the side plates removed Fig. shows a view at right angles to that of Fig. 6, one of the sideplates beingjcut away so as to illustrate the interior construction;-

Fig. 8 shows diagrammaticallyv a circuit similar to that of Fig. 1, but modified by the substitution of a tapped inductance instead of the plain inductance in the unit of Fig. 1; Fig. 9, shows diagrammatically the connec- .tions of the modified unit'which isincorporated in the arrangement of Fig. 8; N

Fig. 10, shows diagrammatically another circuit correspondingto that of Fig. 3, but with a tapped inductance instead of the plain inductance of the unit ofFig; 3; and

Fig. 11, shows diagrammatically thecon= nections of the modified unit which is incorporated in the arrangement of Fig. 10.

Referring firstv to Figs. 1 and2, the circuit 'illustrated in Fig. 1 includes the detector tube 8 and the amplifier tube 9 for thefirst The. grid stage of audio frequency amplification.

with the filament 13, grid 14 and plate 15, all

in accordance with standard practice. The

A battery l6'is provided for illuminatingtbe filaments 10 and 13,'havingits positive side connected to the bus-bar 17 and its negative side connected to the bus-bar 1%.v The rheostat 19 for the detector tube filament is placed preferably in the negative lead and the rheostat-QO for the amplifier tube filament is pref-- erablylplaced in the positive lead as illustrated. 1 This arrangementwill facilitate the tuning and adjustment of the circuit, since the adjustment of the filaments will in this case.

not interfere with" the circuit adjustment.

The incoming signals may be delivered to s the detector tube in anyconvenient manner and under any desired system of tubing. The 1 including a tuner '21 having the primary and secondary coils QQ-and 23 respectively- The variable con denser 26 is connected across the secondary coil 23 so as to tune the same to incoming signals. One side of the coil 23 and condenser 26 is connected to the grid 11 by a lead 27, and

the other side is connected to a reactance coil 28 preferably comprising a single coil having a core 29. The other side of this coil is connected by a lead 30 with the positive side of the A battery. This coil 28 or 28 may be used in place of the usual form ofgrid leak, either with or without the other features of invention herein disclosed; and when said coil 28 is used in place of a grid leak it should have a reactance of approximately 200 henries and a resistance of 1,000 to 4,000 ohms. The plate 12 of the detector tube 8 is connected by a lead 31 with the resistance 32. The other'side of this resistance is connected by a 7 lead 33 with the positive side of the battery 34 (preferably a 22 volt battery) and the negative side of said batteryis connected by a lead 35 with the positive bus-bar 18 of the A battery. The resistance 32 is, therefore, in effect connected across the plate and filament of the detector tube.

The plate end of the resistance 32 is also I. connected to one side of a small fixed condenser 36 the other side of which connects by a lead 37 with the tube 9. e

The reactance coil 38'preferably including a core 39 is connected across the grid 14 and grid 14 of the amplifier the filament 13 of the amplifier tube 9, and,

therefore, also in parallel with the resistance 32 (including the battery 34).

The output (illustrated as a headphone 40) is connected across the plate 15 and the positive side of the circuit by the leads 41 and 42.

Preferably also a booster battery (for example, a 90 volt battery) 43 is included in the lead 42 so as to give more power in the headphone.

, .The resistance 32 preferably has a value of approximately one-l1alf meg-ohm or less,

'the fixed condenser 36 is preferably of apthe above amounts, I do not intend to limit claims. V

It will be noted that the small fixed con myself thereto except as I maydo so in the denser, resistance, and reactance, are all brought together atmore or less of a common point in the circuit and intermediate between the tubes. It is, therefore, possible to as semble all of these parts conveniently as a single unit having the necessary terminal connections, so thatit may be easily set into or removed from the circuit as a whole. I have,

therefore, illustrated these parts diagram-' matically in Fig. 2 as assembled upon a common plate 44, having the terminal or binding posts 45, 46, 47 and 48. The post 45 is intended to connect with the plate 12 and is,

to be connected to the grid 14 and is, therefore, marked G, the post 47 is intended to be connected to the positive side of. the battery- 43 and is, therefore, marked Plus, and the post 48 is intended to be connected to the negative side of the filament 43, and is, therefore, marked N. F

InFigs. 5, 6 and 7 I have typical construction of unit corresponding to the'diagram layout of Fig. 2. It includes the coil 49 built onto the core 50, which .core is then protected by the side plates 51 and 52, and the end coverplates 53 and 54, which also serve to establish the pedestal-portions or feet 55, and also includes the top plate 56, preferably of bakelite orfiber or the like. The binding posts 45, 46, 47 and 48 are placed in .the four corners of the block'56, as" indicated in Fig. 5. The two binding posts 45 and 47 are preferably connected to clips 57, and 58 between which may be snapped the block 59 7o therefore, marked P, the post 46 is intended illustrated a constituting the grid leak. The condenser 36 i being relatively thin and of small size may be suspended at one side of the coil 49 by means of a lug 60 which reaches downwards from the binding post 45. The other side of said condenser is preferably connected by a wire 61 leading across through the core 50 to the other side of the unit where it is conveniently connected to the binding post 46. One side of the coil 49 also connects to the lead 61. The other side of the coil connects directly to the binding post 48, in accordance with the diagram illustrated.

It will be noted that the two cover plates bestillustrated in Fig. 7, so as to give the unit a more finished apearance and also to establish additional space for the accommodation of the condenser 36.

It will also be noted that the upper portion of the cover plates 51 and 52 are preferably drawn inwardly somewhat so as to register flush with the edges of the top plate 56. Said plate may also berecessed inits top face, as illustrated at 62 in Fig. 5, so as to receive a name plate or other symbol.

Referring now to Figs. 3 and 4. I have therein illustrated diagrammatically an arrangement very similar to that of Figs. 1 and 2, with the exception that the positions of the reactance, coil. 38 and gridleak 32 have been reversed, the coil being placed at the plate side of the detector tube 8 and the grid leak at the grid side of the amplifier tube 9. With the exception of the foregoing changes, the two circuits are very similar in arrangement and operation 1 i In order to adapt the unit itself convenient 51 and 52 are preferably bulged outwards, as

V which they are intended to be connected.

' Thus, thebinding post 45 will be marked G instead of P, the binding post 46 will be marked P instead of G, and the binding post 47 will be marked N. F. instead of Plus, and

the binding post 48 will bemarked Plus in stead of N. F. I I

It'will be understood that in case there is more than one stage of amplification, another unit may be set between the tube- 9 and the next tube of the series, etc., these units being placed at the succeeding stages of amplification. 9

Owing to the fact that there is but a single coil in each of the translation runits, any distortion and other deleterious effect will be greatly reduced, so that the tones will be translated from stage to stage in a much more perfect and true condition than is possible in the case of the use of ordinary transformers having primary and secondary windings.

Furthermore, the elimination from the unit of one or more windings such as are found in ordinary transformers will materially reducethe cost and complication thereof with result ant benefits which can only be appreciated by actual use of the present unitsin service. Referring to Fig. 1 it will be noted that the coil 38 serves the additional function of at all times by-passing negative charges accumulating at the grid 14 of the amplifier tube, and passing them to the filament of said tube. A similar function with respect to the grid 11 of the detector tube 8 is performed by the coil 28. v I

Referring also to Fig. 1, the coil 38 is of such relatively low resistance as to allow direct current accumulated on the grid to flow to the filament but the impedance of said coil is sufficient to avoid interference with proper functioning of the tube.

In many cases it may be desirable to tap the condenser into the body of the winding 38 l of Fig. 1 as shown by the dotted line 38 of i the modification shown in Fig. 8 instead of connecting directlytothe end of said winding, leaving the grid connected to the end of said winding or to tap the plate 12 of Fig. 3 into the body of the winding 38 of said figure as shown by the dotted line 38 of the modification shown in Fig. 10, leaving the condenser connected to the end of said winding. This will be the case, for example, where it is desired to increase the ratio of amplification.

While I have herein shown and described only certain embodiments of the features of my present invention, still I do not intend to limit myself thereto, except as I may do so in the claims.

I claim:

1. The combination with a detector tube receiving set, each tube having a filament, a grid and a plate, and'an Abattery for illumi plate and grid, a resistance of substantially one-half meg-ohm connected directly between the plate side of the condenser and the positive side of the B battery, and a reactance coil of substantially 100 to 200 henries connected directly between the grid side of the condenser and the negative side of the battery, substantially as described. s

2. The combination with a detector tube and amplifier tube of a radio carrier wave receiving set, each tube having a filament,,a grid and a plate, and an A battery for illuminating the filaments and a B battery, of a self-contained transfer unit interposed between the plate of the detector tube and the grid of the amplifier, tube, said unit including ,a fixed condenser connected directly between said plate and grid, .a resistance con i nating the filaments and a B battery, of a self-contained transfer unit interposed between the plate of thedetector tube and the grid of the amplifier tube, said unit including a fixed condenser, two connecting elements on the transfer unit connected to the two sidesof the condenser and adapted to be connected directly to the plate and grid aforesaid, a resistance having one end connected directly to one of saidconnecting elements, a reactance coil having one end connected directly to the other of said connecting elements, and two other connecting elements on said unit connected to the free ends of the resistance and reactance respectively and adapted to be connected to the B battery and negative filament respectively, substantially as described.

' 4. As a new article ofmanufacture, a selfcontained transfer. unit for the purpose specified including in. combination a fixed condenser of substantially .06 mf. capacity, a re sistance of substantially one-half meg-ohm having one end connected directly to one side of said condensena reactance coil of. substantially 100 to 200 henries having one'end connected directly to the other'side of the condenser, and binding posts connected to both ends of the reactance coil and to both ends of the resistance, substantially as described.-v

coil having one point connected directly to V the other side of said condenser, means for connecting to at least two points ofthe current resisting conducting element, and means for connecting to at least two points of the reactance, substantially as described;

HENRY E. BURKET. 

